Toán Lớp 5: tính nhanh :
67 x 10 + 67 : 0,1 + 67 x 80
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Toán Lớp 5: tính nhanh :
67 x 10 + 67 : 0,1 + 67 x 80
Comments ( 2 )
67 xx 10 + 67 : 0,1 + 67 xx 80
= 67 xx 10 + 67 : 1/10 + 67 xx 80
= 67 xx 10 + 67 xx 10 + 67 xx 80
= 67 xx ( 10 + 10 + 80)
= 67 xx 100
= 6700
67xx10+67:0,1+67xx80
=67xx10+67xx10+67xx80
=67xx(10+10+80)
=67xx100
=6700